One hundred years ago in America, three types of vehicles with different power sources were vying to become the most popular type of automobile on the market: steam-powered vehicles, electric vehicles, and gasoline-powered vehicles. Of the three, gasoline-powered vehicles eventually emerged ahead of the competition and its number of sales rapidly increased. Today, as we head into the 21st century, automobile technology is about to undergo a drastic change. So just what is the ace power plant that will carry us through a new age? I firmly believe that the answer to this question is hybrid vehicles. I say this because they not only best match the conditions under which vehicles have become popular in the past, but also best meet the demands from society to help reduce global warming.